Advanced Open Gap Fill reviews the different types of grammar words (determiners, pronouns, prepositions etc) which are tested on the open gap fill question of the Cambridge Advanced exam. The eight lessons of the app consist of three sections each. The Notes section reviews the target words and expressions which are then further explored in a Preview activity. The Practice section provides gap fill tests with correction in real time to test the skills and lexis acquired. Advanced Open Gap Fill is primarily intended for students preparing to take the CAE but is suitable for all advanced students.